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5x-y=4
x-y=0*(-5)
5x-y=4
-5x-y=-5
5x-y=4
-5x-y+5x-y=-1
-2y=-1/:(-2)
y=½
b)
4x+3y=2/*2
7x+6y=2/*(-1)
8x+6y=4
-7x-6y=-2
8x+6y-7x-6y=2
x=2
4x+3y=2
4*2+3y=2
8+3y=2
3y=-6/:3
y=-2
c)
x-2y=8
4x+y=5/*2
x-2y=8
8x+2y=10
x-2y+8x+2y=10
9x=10/:9
x=10:9
x-2y=8
10:9-2y=8
-2y=-8:9/:(-2)
y=-4:9
liczę na naj ;D
5x-y=4
5x-x=4
4x=4
x=1 y=1
4x+3y=2 |*(-2)
7x+6y=2
-8x-6y=-4
7x+6y=2
-x=-2
x=2
y=-2
x-2y=8
4x+y=5
x= 2y+8
4x+y=5
4(2y+8)+y=5
8y+32+y=5
9y=-27
y=-3
x=2